Which of the following best describes the primary focus of microbiology?

• A. The study of the structure and function of human organs
• B. The study of chemical reactions in living organisms
• C. The study of animal behavior in natural environments
• D. The study of organisms too small to be seen without a microscope

Answer: (D)

Verified step by step guidance

1. Step 1: Understand the scope of microbiology by recognizing that it deals with organisms that are not visible to the naked eye.
2. Step 2: Identify the key characteristic of microorganisms, which is their microscopic size, requiring a microscope for observation.
3. Step 3: Compare the given options to see which one aligns with the study of microscopic organisms rather than larger biological systems or behaviors.
4. Step 4: Eliminate options related to human organ structure, chemical reactions in general, and animal behavior, as these fall under other biological disciplines.
5. Step 5: Conclude that the primary focus of microbiology is the study of organisms too small to be seen without a microscope.